2005-2006 SILVERADO 1500 5.3L FLEX FUEL ONLY. 2007 SILVERADO 1500 CLASSIC. 2005-2006 AVALANCHE 1500 5.3L FLEX FUEL ONLY. Each Injector Is Ohm Tested For Proper Resistance. Each Injector Is Back-Flushed In A Third Heated Ultra-Sonic To Remove Internal Debris.
